Ключевые слова: abstract, background, blackboard, blur, blurred, blurry, board, boardroom, bokeh, boy, business, child, class, classroom, computer, concept, corporate, defocus, defocused, disorganized, educate, education, focus, friends, fun, group, interior, kid, laptop, lecture, light, lights, notebook, office, people, play, presentation, professional, room, scene, school, sit, spotlight, student, study, teacher, together, training, white, young,